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  <blog_url>https://blog.systemjp.net/</blog_url>
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    <anon>Ruby</anon>
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  <description>文字列中に含まれている任意文字列の位置を求める無かったらnilが返る s = &quot;Apple Banana Apple Orange&quot; p s.index(&quot;Apple&quot;) #=&gt; 0 p s.index(&quot;Banana&quot;) #=&gt; 6 p s.index(&quot;Apple&quot;, 6) #=&gt; 13 p s.rindex(&quot;Apple&quot;) #=&gt; 13 p s.rindex(&quot;Apple&quot;, 6) #&gt;= 0ネタ元 http://www.namaraii.com/rubytips/?%CA%B8%BB%FA%CE%F3#l24</description>
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  <provider_name>Hatena Blog</provider_name>
  <provider_url>https://hatena.blog</provider_url>
  <published>2010-01-20 00:00:05</published>
  <title>文字の検索</title>
  <type>rich</type>
  <url>https://blog.systemjp.net/entry/20100120/p2</url>
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